Improvement in locomotives



UNITED STATES WILLIAM D. ARNETT, OF DENVER, COLORADO TERRITORY.

IMPROVEMENT IN LOCOMOTIVES.

Specification forming part of Letters Patent No. 117,031, dated July 18, 1871.

To all whom it may concern:

Be it known that I, WILLIAM D. ARNETT, of Denver, Arapahoe county, Territory of Colorado, have invented a new and useful Improvement in Locomotives; and I do hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing making part of this specification, in .which- Figure 1 is a side view of a locomotive having my improvement applied to it. Fig. 2 is a top view of the same. Figs. 3 and et are views representing the combination of two steam-cylinders with a valve-seat adapted therefor.

Similarletters of reference indicate corresponding-parts in the several figures.

This invention relates to certain improvements on the invention set forth in the schedule annexed to my Letters Patent bearing date on the 7th day of February, 1871. The natureof this invention consists in the arrangement, on each side of the locomotive and upon a suitable frame, of two steam-cylinders, both communicating with a single valve-chest, and bothA connected, through their piston-rods and pitmen-rods, with a crankshaft, which latter is connected by four pitmenrods to the crank-axle and faces ofthe rear drivzontal transverse beam thereof, are four steam- A cylinders, E, arranged on each side of the frame in pairs. These cylinders are inclined, as shown in Fig. 1, so that their longitudinal axes intersect the axis of a horizontal transverse crankshaft, C, which is located over and inthe vertical plane of the axle P of the rear drivingwheels B', and which is supported on the top of the frame D. Each pair of steam-cylinders E E is supplied with steam through ports g g g g', and vexhaust through ports S, which are made through a valve-bed, V, on which a single slidevalve works. In this Way two cylinders, E E, on each side of the locomotive, are supplied with steam at the same time, and through a` single valve-chest, and exhaust through a single port in the valve-seat bed V. The piston-rods e of the two pairs of steam-cylinders E E are connected to the front ends of pitmen-rods a, which are connected at their ends to cranks b on the shaft C. Each`pair of cranks I) I) is arranged at quarter-stroke, or, in other words, each pair is arranged at right angles, as indicated in Fig. 1, so that while one pair of pistons is pushing, the other pair is pulling. The cranks b on the outer ends of the shaft O are connected to wristpins i on the outer faces of the rear drivingwheels by means of pitmen-rods d cl,- and to the same wrist-pin i rods p are connected, which are also connected to wrist-pins on the next forward wheels B. These latter wheels B are connected to the front wheels B by means of rods p', as shown in the drawing. In this way the pistonrods of the outer cylinders on both sides of the locomotive are connected indirectly to the rear driving-wheels. The rods a of the inside steamcylinder are connected to cranks on the axl P of the rear driving-wheels.

By this arrangement the force is applied in a vertical or nearly vertical direction to turn the rear driving-wheels of the locomotive, while the steam-cylinders through which this force is transmitted are arranged near the forward end of the locomotive and operate alternately in pairs. l

Having described my invention, what I claim as new, and desire to secure by Letters Patent, 1s-

The arrangement, on each side of a locomotive,` of a pair of steam-cylinders, which receives steam through a single slide-valve bed, V, and Whose piston-rods e c communicate motion to the crankshaft P of the rear' driving-wheels through pitmen-rods a a and d d', substantially as described.

WILLIAM D. ARNETT.

Witnesses:

GEORGE W. LEAs, JOHN WV. VVEBsTER. 

